Abstract
In this study, the effects of severe shot peening on ambient temperature long crack growth, threshold and closure behavior in Nickel-based superalloy Inconel 718 and stainless steel AISI 301 were investigated. To assess the relationship between shot peening, crack tip shielding and crack growth, pre-cracked disk-shaped compact tension (DC(T)) specimens were treated at distinct locations around and ahead of the crack front. A beneficial influence of shot peening on crack propagation and closure was only identified in Inconel 718, albeit limited to shot peening of the entire area around the crack front. In contrast, the applied shot peening treatments had detrimental effects on crack growth properties in AISI 301. While the effective threshold of Inconel 718 was not affected by shot peening, AISI 301 featured a decreased intrinsic resistance against the onset of crack propagation. Strain-induced near-surface α′-martensite formed due to shot peening of AISI 301 was found to promote martensite formation during crack growth, giving rise to embrittlement of the material.
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